Broaching attachment



' Waal/ey 5mm #35H7 WALLACE' SEM/4N By @W and A W SEAMAN BROACHINGATTACHMENT Aug. 1, 1950 Filed Oct. 5o, 1946 Augl, 1950 A. w. sEAMAN2,517,358

BRoAcHING ATTACHMENT Filed Oct'. 30, 1946 2 Sheets-Sheet 2 InventorALBERT WAL LESEMA/ 3 Il "fl and# //f-f Attoneys Patented Aug. 1, 1950UNITED STATESPATENT OFFICE BRUACHING ATTACHMENT Albert Wallace Seaman,Hutchinson, Kans.

Application October 30, 1946, Serial No. 706,527

10 Claims. (Cl. 90--33) This invention relates to a novel and usefulattachment for a drill press, and more specically comprises a broachingand key seating attach ment which may be readily supported by andassociated with a conventional type of drill press and may be detachablydriven thereby.

The principal objects of this invention are to provide a device which isreadily engageable with a conventional type of drill press and whichwill enable the drill press to perform broaching and key seatingoperations; wherein a convenient and readily engageable form of drivingconnection is provided between the attachment and the drill chuck of thedrill press; and wherein novel and edicient guiding means are providedfor oper'- atively supporting the breaching tool in the device.

These, together with various ancillary objects of the invention whichwill later become apparent as the following description proceeds, arerealized by my invention, one embodiment of which has been illustratedby way of example only in the accompanying drawings, wherein:

Figure 1 is a side elevational view showing the attachment applied to aportion of a drill press; 1

Figure 2 is a top plan view of the attachment.;

Figure 3 is a lower plan view of the attachment;

Figure 4 is a detail in vertical section taken substantially upon thesection line 4-4 of Figure 1, and

Figure 5 is a detail View in vertical section being taken substantiallyupon the section line 5-5 of Figure l.

Referring now more specifically to the annexed drawings, wherein likenumerals designate similar parts throughout the several views, numeralIll designates generally my improved attachment. As shown best in Figure1, the attachment Ill comprises a right-angularly curved support memberl2 having one end thereof terminating in a split clamp indicated at I4and which is adapted to engage the vertical column it of a conventionaltype of drill press for detachably supporting the device thereon. Theother end of the curved support member I2 is integrally formed with anarm I8 which extends substantially parallel to the clamping means I4,and is of sufficient length to be positioned to underlie the usual drillchuck 2B of the drill press. Journaled in the arm I8 is a crankshaft 22which is adapted to be engaged detachably in the chuck socket 2D of thedrill press and which is provided with a crank cheek 24 adapted tounderlie and abut the lower surface of the arm I8, the crankshaft 22detachably journaling a crank connecting rod 26 which engages abroaching tool in a manner to be later set forth.

Adjacent the arm I8 and extending oppositeiy therefrom is a guide 28integrally carried by the support member I2, and which, as shown best inFigure 4, is composed of a channel member of cylindrical cross-sectionand which is longitudinally slotted at its under-surface, as at 30. Theoutward end of the guide member 28 has a forwardly and downwardlydepending lug 32 which is adapted to abut or provide a stop for a pieceof work to be operated upon by the broaching or key seating tool.Slidably received within the guide member 28 is a broaching tool 34 of acrosssection conforming and corresponding to the in ternal surface ofthe guide, and provided at its lower surface and its outer extremitywith teeth or the like 36. The rearward surface of the broaching tool 34is pivoted, as at 38, to the outer end of the connecting rod 2'6.

As shown best in Figure 1, the tool 3A# has a longitudinally extendingchannel 35 upon its lower side, which channel has an undercut portion 37at its inner end. A detachable tool blade or bit ill carrying theaforementioned teeth 36 is removably seated in the channel 35, with itsrear end seated in the portion 3l for retaining engagement therein, Theforward end of the tool 34 has a screw-threaded extension 42 upon whichis threaded a nut 44 for securing a retaining cap llt. The latter has aflanged lip embracing the for ward end of the tool blade 40 for securelyfastening the latter in the channel 35.

From the foregoing, it is believed that the operation of the device willnow be apparent` The support I2 is attached in a depending position fromthe vertical housing I6 of a conventional drill press, by means of theclamp I4, it being understood that the latter will accommodate thedevice to various sizes of drill press housings. The crank 22 is nowinserted in the arm IB and into the drill press socket 20 and issecured. thereto in a conventional manner. Upon rotation of the drillpress chuck 2l), the connecting rod 2S causes reciprocation of thebroaching tool. shank 34 in the guide socket 28, whereby the teeth 3Smay be specically designed to perform a particular type of work, such asbroaching, key seating, sawing, or the like, and that the channel 35 andblade It!) as Well as the guide 28 and tool 34 may be of any desiredshape.

In View of the foregoing description taken in conjunction with theaccompanying drawings, it is believed that a clear understanding of theconstruction, operation and advantages of the device will be quiteapparent te those skilled in this art. A more detailed description isaccordingly deemed unnecessary.

It is to be understood, however, that even though I have herein shownand described a preferred embodiment er" my invention that the same issusceptible to certain changes fully comprehended by the spirit ei theinvention as herein described and Within the scope of the appendedclaims.

I claim as my invention:

1. A breaching attachment for drill presses including a ene-piecesupport, a clamp for securing said support upon the vertical column of adrill press, a crank jeurnaled in said support and engageable with thedrill chuck er a drill press, a guide carried by said support, abreaching tool slidable in said guide and a connecting rod piveted tosaid crank and te said breaching tool.

2. A breaching attachment for drill presses including a ene-piecesupport, a clamp for securing said support upon the vertical column of adrill press, a crank jeurnaled in said support and engageable with thedrill chuck of a drill press, a guide carried by said support, breachingtool slidable in said guide and a connecting red pivoted to said crankand to said breaching tool, said guide being of circular cross-sectionand said breaching tool having a body guide portion of circularcross-section slidable longitudinally in said guide.

A. breaching attachment for drill presses including a one-piece support,a clamp ier securing said support upon the vertical column oi a drillpress, a crank jeurnaied in said support and engageable with the drillchuck of a drill press, a guide carried by said support, a breachingteel slidable in said guide and a connecting red piveted to said crankand to said breaching tool, said support having an arm extendingoppositely te said guide and parallel to said clamp and adapted teunderlie the drill chuck ef a drill press, said crank being jeurnaled insaid arm and having a cheek bearing upon the under-side of said arm.

Ll. A breaching attachment for drill presses including a one-piecesupport, a clamp for securing said support upon the vertical column of adrill press, a crank jeurnaled in said support and engageable with thedrill chuck of a drill press, a guide carried by said support, abreaching tool slidable in said guide and a connecting rod piyoted tosaid crank and te said breaching tool, said guide being or circularcross-section and said breaching tool having a body guide portion ofcircular cross-section slidable longitudinally in said guide, said guideconsisting of a channel memn ber having a longitudinal slot along oneside thereof.

5. A breaching attachment for drill presses including a ene-piecesupport, a clamp for secur 4 i ing said support upon the vertical columnof a drill press, a crank jeurnaled in said support and engageable withthe drill chuck of a drill press, a guide carried by said support, abreaching tool slidable in said guide and a connecting rod pvoted tosaid crank and to said breaching tool, `said breaching tool having atool blade receiving channel in its lower surface and a tool bladeremovably secured in said channel.

6. A breaching attachment for drill presses including a ene-piecesupport, a clamp for securing said support upon the vertical column of adrill press, a crank journaled in said support and engageable with thedrill chuck of a drill press, a guide carried by said support, abreaching tool slidable in said guide and a connecting rod pveted tosaid crank and te said breaching tool, said breaching tool having a toolblade receiving channel in its lower surface and a tool blade removablysecured in said channel, said tool blade having one end secured in anaxial recess in an end of said channel and the other end secured by adetachable cap at the other end of said channel.

7. In a drill press having a vertical column, a rotary shaft in thecolumn and a chuck carried by the shaft; a breaching attachmentcomprising an arcuate support, a clamp carried at one end of saidsupport for securing the latter upon the vertical column, a tubularguide extending from the other end of said support, an arm carried bythe other end of said support and extending in an opposite direction tosaid guide, a bearing at the end of said arm coaxial with said clamp, acrank ,ieurnaled in said bearing and engageable with the chuck, abreaching tool slidable in said guide, and a connecting red pivoted teSaid crank and te said breaching tool.

8. 'lhe combination of claim 7 wherein said crank includes a cheekengaging the underside of said bearing.

9. The combination of claim 'Z wherein said guide includes alongitudinal slot along one side thereof and said breaching toolincludes teeth extending through said slet.

l0. The combination of claim 9 wherein said guide includes a dependingstop at its free end adapted to abut a piece of Work te be operated uponby said breaching tool.

ALBERT WALLACE SEAMAN.

REFERENES CITED The following references are of record in the file ofthis patent:

UNITED STATES PAIENTS Number Name Date 678,341 Helmberg July 9, 19011,366,005 Janssen Jan. 18, 1921 1,367,680 Allen Feb. 8, 1921 1,502,088Colby July 22, 1924

